Communication-Dissolution and Passivation of a Ni-Cr-Fe-Ru-Mo-W High Entropy Alloy by Elementally Resolved Electrochemistry

Xuejie Li; Junsoo Han; Pin Lu; James E. Saal; Gregory B. Olson; Gerald S. Frankel; John R. Scully; Kevin Ogle

doi:10.1149/1945-7111/ab7f86

Communication-Dissolution and Passivation of a Ni-Cr-Fe-Ru-Mo-W High Entropy Alloy by Elementally Resolved Electrochemistry

Xuejie Li, Junsoo Han, Pin Lu, James E. Saal, Gregory B. Olson, Gerald S. Frankel, John R. Scully, Kevin Ogle^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

The formation and dissolution of the passive film on a novel NiCrFeRuMoW high entropy alloy in H₂SO₄ was measured with atomic emission spectroelectrochemistry. Passivation involved Cr and Ru enrichment, whether passivation was achieved spontaneously at open circuit or by potentiostatic step into the passive domain. The other elements, Ni, Fe, Mo, and W, dissolved at rates approximately proportional to their bulk concentrations. The air formed film showed only a Cr enrichment. Excellent corrosion resistance properties were indicated by spontaneous passivation, the low passive current in the polarization curve, and the absence of detectable elemental dissolution during the active peak.

Original language	English (US)
Article number	061505
Journal	Journal of the Electrochemical Society
Volume	167
Issue number	6
DOIs	https://doi.org/10.1149/1945-7111/ab7f86
State	Published - Jan 4 2020

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

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10.1149/1945-7111/ab7f86

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abstract = "The formation and dissolution of the passive film on a novel NiCrFeRuMoW high entropy alloy in H2SO4 was measured with atomic emission spectroelectrochemistry. Passivation involved Cr and Ru enrichment, whether passivation was achieved spontaneously at open circuit or by potentiostatic step into the passive domain. The other elements, Ni, Fe, Mo, and W, dissolved at rates approximately proportional to their bulk concentrations. The air formed film showed only a Cr enrichment. Excellent corrosion resistance properties were indicated by spontaneous passivation, the low passive current in the polarization curve, and the absence of detectable elemental dissolution during the active peak.",

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AU - Saal, James E.

AU - Olson, Gregory B.

AU - Frankel, Gerald S.

AU - Scully, John R.

AU - Ogle, Kevin

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Communication-Dissolution and Passivation of a Ni-Cr-Fe-Ru-Mo-W High Entropy Alloy by Elementally Resolved Electrochemistry

Abstract

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